I am trying to create an Android 13 based demo system, to demonstrate some audio post processing software that I created. (The software does things like: automatic gain control, and 4+ channel audio spatialization.) I need to capture (intercept) the audio data from all audio sources, just before it goes to the audio device, process it, and then send the audio to the appropriate ALSA device/channel.

On my test device, I have an Android 13 AOSP build that I did not create, so I am looking for a solution that does not require me to rebuild AOSP. I am cool with using ADB to modify system configuration and binary files.

Any suggestions???